Merge upstream origin/main with local fork additions preserved

Accept upstream's ce-review pipeline rewrite (6-stage persona-based
architecture with structured JSON, confidence gating, three execution
modes). Retire 4 overlapping review agents (security-sentinel,
performance-oracle, data-migration-expert, data-integrity-guardian)
replaced by upstream equivalents. Add 5 local review agents as
conditional personas in the persona catalog (kieran-python, tiangolo-
fastapi, kieran-typescript, julik-frontend-races, architecture-
strategist).

Accept upstream skill renames (file-todos→todo-create, resolve_todo_
parallel→todo-resolve), port local Assessment and worktree constraint
additions to new files. Merge best-practices-researcher with upstream
platform-agnostic discovery + local FastAPI mappings. Remove Rails/Ruby
skills (dhh-rails-style, andrew-kane-gem-writer, dspy-ruby) per fork's
FastAPI pivot.

Component counts: 36 agents, 48 skills, 7 commands.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

plugins/compound-engineering/skills/excalidraw-png-export/scripts/setup.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+# First-time setup for excalidraw-png-export skill.
+# Installs playwright and chromium headless into a dedicated directory.
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+EXPORT_DIR="$SCRIPT_DIR/.export-runtime"
+
+if [ -d "$EXPORT_DIR/node_modules/playwright" ]; then
+  echo "Runtime already installed at $EXPORT_DIR"
+  exit 0
+fi
+
+echo "Installing excalidraw-png-export runtime..."
+mkdir -p "$EXPORT_DIR"
+cd "$EXPORT_DIR"
+
+# Initialize package.json with ESM support
+cat > package.json << 'PACKAGEEOF'
+{
+  "name": "excalidraw-export-runtime",
+  "version": "1.0.0",
+  "type": "module",
+  "private": true
+}
+PACKAGEEOF
+
+npm install playwright 2>&1
+npx playwright install chromium 2>&1
+
+# canvas provides accurate text measurement for convert.mjs.
+# Requires Cairo native library: brew install pkg-config cairo pango libpng jpeg giflib librsvg
+# Falls back to heuristic sizing if unavailable.
+npm install canvas 2>&1 || echo "WARN: canvas install failed (missing Cairo?). Heuristic text sizing will be used."
+
+echo "Setup complete. Runtime installed at $EXPORT_DIR"